| 年份 | 中国 |
|---|---|
| 2023 | - |
| 2022 | 8.48771 |
| 2021 | 8.36543 |
| 2020 | 8.23831 |
| 2019 | 8.11818 |
| 2018 | 8.09689 |
| 2017 | 8.09951 |
| 2016 | 7.72963 |
| 2015 | 7.03007 |
| 2014 | 6.34152 |
| 2013 | 5.67861 |
| 2012 | 5.30038 |
| 2011 | 5.43298 |
| 2010 | 5.81455 |
| 2009 | 6.19193 |
| 2008 | 6.40808 |
| 2007 | 6.41721 |
| 2006 | 6.33887 |
| 2005 | 6.19739 |
| 2004 | 5.96299 |
| 2003 | 5.68776 |
| 2002 | 5.36471 |
| 2001 | 5.0411 |
| 2000 | 4.74711 |
| 1999 | 4.47009 |
| 1998 | 4.24709 |
| 1997 | 4.05875 |
| 1996 | 3.93556 |
| 1995 | 3.87658 |
| 1994 | 3.8452 |
| 1993 | 3.84476 |
| 1992 | 3.87848 |
| 1991 | 3.90695 |
| 1990 | 3.94254 |
| 1989 | 4.00691 |
| 1988 | 4.07148 |
| 1987 | 4.0975 |
| 1986 | 4.08164 |
| 1985 | 4.05192 |
| 1984 | 4.00929 |
| 1983 | 3.94189 |
| 1982 | 3.88547 |
| 1981 | 3.84176 |
| 1980 | 3.79393 |
| 1979 | 3.7626 |
| 1978 | 3.72282 |
| 1977 | 3.66188 |
| 1976 | 3.62765 |
| 1975 | 3.60148 |
| 1974 | 3.55099 |
| 1973 | 3.50394 |
| 1972 | 3.48981 |
| 1971 | 3.4961 |
| 1970 | 3.51154 |
| 1969 | 3.56094 |
| 1968 | 3.64546 |
| 1967 | 3.70108 |
| 1966 | 3.71598 |
| 1965 | 3.73155 |
| 1964 | 3.74591 |
| 1963 | 3.76778 |
| 1962 | 3.80746 |
| 1961 | 3.8394 |
| 1960 | 3.859 |